Automatic overdraft device for



May 4, 193 7.

@@@QQQQQ y gva/manto@ Charles L. Lee Y HS C1 fr May 4, 1937. c. L. LEE 2,079,355

AUTOMATIC OVERDRAFT DEVICE FOR CALCULATING MACHINES Filed April 14, 1932 14 Sheets-Sheet 2 33 I 'f' l lla/llllllllll/llllM/IIA gri/venten Charles L. Lee

LBy

H iS dumm May 4, 1937. C, L LEE A2,079,355

AUTOMATIC OVERDRAFT DEVICE FOR CALCULATING MACHINES Filed April 14, 1952 14 Sheets-Sheet 5 'ama B Charles L. Lee

His (Inv: un,

C. L. LEE

May 4, 1937.

AUTOMATIC OVERDRAFT DEVICE FOR CALCULATING MACHINES AFiled April 14, 1932 14 sheets-Sheet 4 ln/vento@ Charla L. Lee

May 4, 1937. c. LEE 2,079,355

AUTOMATIC ovERDRAFT DEVICE FOR CALCULATING MACHINES Filed April 14, 1932 14 Sheei'sheet 5 FIG. T

Charles L. Lee Y HS (1R01 neu May 4, 1937. C L LEE 2,079,355

AUTOMATIC OVERDRAFT DEVICE FOR CALCULATING MACHINES Filed April 14, 1952 14 Sheets-Sheet 6 In/venten Charles L. Lee

May 4, 1937. C, L, LEE 079,355

AUTOMATIC OVERDRAFT DEVICE FOR CALCULATING MACHINES Filed April 14, 1952 14 Sheets-Sheet 7 FIG.1O

FIG. 11 '84 39| Charles L. Lee

May 4, 1937. Q LEE 2,079,355

AUTOMATIC OVERDRAFT DEVICE FCR CALCULAMNG MACHINES Filed April 14, 1932 14 Sheets-Sheet 8 y nwnoz Charles L. Lee

His dumm.,

c. L. LEE 2,079,355

AUTOMATIC OVERDRAFT DEVICE FOR CALCULATING MACHINES May 4, 1937.

' Filed April 14, 1932 14 Sheets-Sheet 9 :Jn/vento@ Charles L. Lee

May 4, 1937. c. L. LEE 2,079,355

n AUTOMATIC OVERDRAFT DEVICE FOR CALCULATING MACHINES Filed Apr-il 14 1932 14 Sheets-Sheet 10 31a/venten Charles L. Lee

May 4, 1937. C. L. LEE 2,079,355

AUTOMATIC CVEEDEAET DEVICE ECR CALCULATING MACHINES FIC-.25

Charles L. Lee' By mE/M A His dNoz nu,

May 4,1937. c. L. LEE 2,079,355

AUTOMATIC OVERDRAFT DEVICE FOR CALCULATING MACHINES 14 Sheets-Sheet 12 'Filed April 14, 1952 gnou/1hr, Charles L. Lee

May 4, 1937. C, L LEE 2,079,355

AUTOMATIC OVERDRAFT DEVICE FOR CALCULATING MACHINES Filed April 14, 1952 14 Sheets-sheet 15 His dlroznaq May 4, 1937. C. LEE 2,079,355

AUTOMA'LIC OVERDRAFT DEVICE FOR QALCULATING MACHNEs Filed April 14, 1932 14 Sheets-Sheet 14 Charles L. Lee

Patented May 4, 1937 UNITED sTATEs PATENT OFFICE AUTOMATICOVERDRAFT DEVICE FOR CALCULATING MACHINES Application April 14, 1932, Serial No. 605,160

23 Claims.

This invention relates to adding typewriters of the Ellis type, which are illustrated and described in Letters Patent of the United States Nos. 1,197,276 and 1,197,278 issued September 5, 1916 to Halcolm Ellis, Patent No. 1,203,863, also issued to Halcolm Ellis November 7, 1916, and Patent No. 1,819,084 issued to Emil John Ens on August 18, 1931. f

The present invention is incorporated in a machine of the well known Ellis type, preferably one having a traveling carriage, and if desired may be equipped with typewriter attachment. Such a machine usually has two to four totalizers, one of which is of the add-subtract type as set out in the Ellis Patent No. 1,203,863, and is arranged to accumulate positive or negative amounts at the. will of the operator.

A machine of this type is well adapted for use in banking establishments where deposits and withdrawals are constantly being made upon individual checking accounts and furnishes a means whereby these different accounts may be accurateiy and rapidly balanced.

Thegeneral procedure in using a machine of this character in the banking business is as follows:

A record sheet for the depositor whose account is to he baianced is inserted in the machine in such a manner that the proper line is in position to be printed upon. The old balance appearing upon the record sheet is then entered into the add-subtract totalizer, next the checks issued by the depositor are subtracted from this old balance and. simultaneously listed individually, and ii' de I, sired may be added into one of the remaining totalizers oi' the machine, the reading of which gives the total amount of the cheeks listed.

Three columns are provided in the instant machine for the listing of checks. The traveling ,m carriage may be tabulated from one column to the next, or the paper may be fed vertically at the discretion of the operator. The next step is the adding of any deposits made intermediate balancing periods, which are, as a general rule, 4;, daily. The operator then takes a total of the add-subtract totalizer to get a new balance, which is printed in the extreme righthand colxnrm c55 the record sheet. y

The occurrence of an overdraft in the acid`1 ,-,0 subtract totalizer is immediately called to the attention of the operator by means of an indicator visibly mounted below the keyboard of the machine. Likewise the occurrence of an overm draft automatically locks the .total key for the s addsubtract totalizer and unlocks an overdraft (Cl. 23S-60) key, thus making it impossible to take a total of the add-subtract totalizer while said totalizer is in an overdrawn condition.

In former Ellis machines, after having ascertained that an overdraft had occurred and manl ually unlocking the total key for the add-subtract totalizer by manipulating the decimal slide, or by depressing the color shift button, the operator could then print the complement of the overdraft by taking a total or sub-total of the addsubtract totalizer. If desired, the operator could ascertain the positive amount of the overdraft by subtracting the complement from zero either .mentally or by hand. In case it was necessary to printl the amount of the overdraft positively on the record sheet or statement the operator was required to make three successive machine operations; rst, to transfer the negative amount or complement of the overdraft from the subtract totalizer to an adding totalizer which had previously been cleared; second, subtract the negative amount from the subtract totalzer, which was reset to zero in the rst operation; and, third, take a totai or sub-total of said totalizer to print positively the amount of the overdraft. i

In the machine of the present invention, upon ascertaining that an overdraft exists the operator may if she sees rit continue the balancing of the account or immediately discontinue such balancing. In either case the depression of the overdraft key causes the machine to automatically operate through three cycles to print the amount of the overdraft in positive fashion upon the record sheet.

Among the objects of thel present invention are these: to provide mechanism for visibly indieating anoverdrawn condition of the add-subtract totalizer, to provide mechanism whereby the operation of a single manipulative member will cause the machine to operate through three successive cycles to obtain a positive printing of the overdraft as outlined above, to supply means for automatically disabling the printing mechanism during the nrst and second cycles of an over draft operation, to provide an auxiliary differential mechanism into which the complement of an overdraft may be temporarily stored, and to supply various interlocks between the overdraft key and the add-subtract totalizer and between the overdraft key and tabulating lever.

With these and incidental objects in View, the invention consists oi certain novel features of construction and combinations of parte, the essential elements of which are set forth in ap- Cil Fig. shows the location of the overdraft indicator as observed from above the keyboard.

Fig. 7 is a top plan view illustrating the side spacing of the various parts of the machine.

Fig. 3 is a detail of the automatic ribbon shifting mechanism.

Fig. 9 is a detail view ci 'the ribbon vibrating mechanism.

Fig. 10 is a detail View showing a fragment of the carriage stop bar with a stop in place thereon, and an add and subtract hanging bar lever.

Fig. 11 is a detail of the totalizer operating plate in 'nome position.

Fig. l2 illustrates the position of the operating plate when the machine has operated through one-half its cycle.

Fig. 13 shows a fragment of the double motor bai' and connecting mechanism for blocking the automatic tabulating mechanism.

Fig. 14 is a detail of the tabulating release mechanism.

Fig. 15 is a view showing in detail the subtract control and operating mechanism.

Fig. 16 is a detail of the automatic controlling mechanism for the overdraft totalizer.

Fig. 17 is a detailed view of the totalizer engaging cam.

Fig. 18 is a view in perspective of dierential.

Fig. 19 shows in detail part of the engaging mechanism for the auxiliary differential.

Fig. 20 is a detail of the auxiliary differential engaging cam.

.-Fig. 21 illustrates the method of stopping the auxiliary differential wheels at zero.

Fig. 22 is a detail view of the ribbon restoring mechanism.`

Fig. 23 illustrates in detail part of the overdraft mechanism.

Fig. 24 shows in detail the method of driving the overdraft cam line.

Fig. 25 is a detail of the overdraft cam line driving pitman.

Fig. 2G is a view in detail showing the overdraft machine release mechanism.

Fig. 27 is a disunited perspective view of the overdraft cam line.

Fig. 28 is a sectional view of the overdraft ,cam line.

Fig. 29 is a section disunited perspective view ofthe overdraft operating mechanism.

Fig. 30 is a perspective view of the subtract totalizer overdraft control mechanism.

Fig. 31 is a detail view of the subtract totalizer shifting line in its add position.

Fig. 32 is a. detail View of the subtract totalizer shifting line in subtract position.

Fig. 33 is a detail in reduced scale of the the auxiliary is a perspective view of the overdraft envases overdraft iocking mechanism by the total key of the subtract totalizer.

34 is a full-size detail of the locking mechanisrn shown in Fig. 33 prior to being tripped.

Fig. 35 is an illustration of the mechanism shown in Fig. 34 after being tripped by an overdraft occurring in the add-subtract totalizer` Fig. 36 is a perspective view showing the automatic overdraft controlling mechanisms and their relation to the machine side frames, the latter being shown in phantom.

in the figure showing the frame work in phantom by dot and dash lines, where the dot and flash lines do not show behind the parts it indicates that such parts are in front of the frames, but Where the dot and dash lines are shown crossing the full line parts it indicates that such parts are behind the frames.

Fig. 37 is a detail view of a tabulating mech anism.

Fig. 38 is a detail view of the tabulating operating levers.

GENERAL Dnscsrr'rxon Described in general terms the machine of the present invention comprises a plurality of totalizers actuated in add operations by key-set actuator racks which also position the printing segments in accordance with the keys depressed. In total operations the actuator racks turn the totalizers to zero and position the printing segments commensurate with the amount on said totalizer wheels.

The mechanism bf the Ellis machine is operated by a constantly running electric motor of conventional design, such as shown in the U. S. Patent-to N. W. Perkins No. 1,136,165 dated April 20, 1915 which is clutched to the machine operating mechanism by the manipulation of a starting bar and is automatically declutched after said mechanism completes its cycle of operation.

The starting bar of the instant machine is pivoted near its center to make it double-acting.

Depression of the upper end of said bar simultaneously releases the machine for operation and causes the platen roll to line-space the paper wound thereon. Depression of the lower end of the starting bar likewise releases the ,machine for operation, and simultaneously causes the traveling carriage to tabulate from one column to another.

The keyboard is arranged substantially the same as other adding machine keyboards, and has a plurality of control keys which select the different totalizers for particular operations and a plurality of amount keys for properly positioning the totalizer actuating racks in add, non-add and subtract operations.

An overdraft indicator is visibly mounted beneath the keyboard and shows at all times whether the add-subtract totalizer is in a positive or negative condition.

An auxiliary storage differential has been incorporated in the present machine and is arranged to cooperate with the actuator racks during an overdraft operation. The complement of the overdraft is first transferred from the addsubtract totalizer to the auxiliary storage differential. This complement is then subtracted from the cleared add-subtract totalizer, which results in the positive setting up of the amount of the overdraft.

An overdraft key is conveniently located on the upper right hand corner of the keyboard and is arranged to exercise complete control over the machine during overdraft operations. Depression of this key causes the machine to automatically operate through the three cycles necessary in overdraft operationsin order to transpose a negative overdraft into a positive amount and to print such positive amount. Depression of the overdraft key also causes the printing mechanism to be disabled for the first and second'cycles oi an overdraft operation and effectively engages the auxiliary differential with the actuator racks. This key also controls mechanism that shifts the ink ribbon to a position where an overdraft will be printed in a distinctive color.

The instant machine has a traveling carriage which carries a tabulating bar upon which stops may be arranged as desired to automatically control the functions of the different totalizers in tabulated positions of said traveling carriage.

The machine in which the present invention is incorporated is equipped with automatic carriage return,'manual tabulating mechanism and various other features usually found on machines of this type.

DETAIL DESCRIPTION Operating mechanism As previously stated, the mechanism of the Ellis machine is driven by an electric motor of the type shown in the above mentioned lPerkins Patent No. 1,136,165 which runs continuously during machine operations. This motor is geared to a driving member of a clutch, not illustrated, An operating link 50 (Figs. 3 and 23) is pivoted on its lower end to a crank stud secured in a driven member of the clutch mechanism, neither of which is here shown. The upper end of the operating link is pivoted to an operating arm 5I secured to a shaft 52 journaled in a pair of main frames 53 and 54 (Figs. 3 and 1) between which the mechanism of the machine is supported. The main frames are secured to a machine base (not shown) to which is also secured the electric driving motor.

" A roller 55 (Figs. 3 and 23) mounted on a stud 56 carried by the arm 5l cooperates with a slot 51 in a plate 58 secured to a shaft 59 also journaled in the main frames 53 and 54. Mounted on the left side of the arm 5| upon the stud 56 is another rollerl 60 (Fig. 8) adapted to cooperate with a camrace 8| formed in a cam plate 82, flexibly connected to an aliner shaft 63 likewise supported by the mainframes 53 and 54.

vSecured to the shaft 59 (Fig. .2) isa leading v frame 64. Pivoted on the shaft 58 is a plurality a link 13 to the printing segment 14.

of reducing' arms 55. A plurality of springs 55 are tensioned to hold the reducing arms in contact withv the leading frame 64. Secured in each reducing arm 65 is a stud 61 which cooperates with a vertical slot 15 in a plurality of actuator racks 1l for a purpose to be later described. An arm 12 of the reducing arm 65 is connected by Another arm 15 of the reducing arm 65 has secured therein a stud 16 which cooperates with an extension 11 of an order hook 13 pivoted on a shaft 18. There is one such reducing arm 55, actuator rack 1I and printing segment 1.4, for each amount bank of the machine. Secured to the shaft 53 is an aliner 58 adapted to cooperate with teeth cut in the reducing arms 65 for the purpose of holding said reducing arms in proper alignment while an impression is being made by the printing segments. In adding and non-adding operations, each time the machne operates, the actuator racks 1i (Fig. 2) follow the leading frame B4 rearwardly until one of the steps 8! contacts the studs 8i in depressed amount keys 8B. This. through the slots 10 in the racks 1| and studs 61 in the reducing arms 65, positions said reducing arms in accordance with the keys depressed, the

reducing arms in turn position'the printing segments commensurate with the values of the depressed keys. K

' In total taking operations the actuator racks are positioned by long teeth on the totalizer Wheels coming in contact with their respective trip pawls and this likewise positions the printing segments in accordance with the amount standing in the totalizer. For' a complete description of the above mechanism reference may be had to the Ellis PatentV No. 1,176,276 referred to at the beginning of this specication.

351180431. Amount keys The-keyboard of the present machine is similar to that of former Ellis machines, and. has a plurality of amount keys (Figs. 1 and 2) arranged in rows, each of which constitutes a denominational. group or bank, such as units of cents, tens of cents, etc. These keys are flexible in that after one key has been depressed in a certain row the depression of another keyl in that row releases the one previously'depressed; and so on. Each amount key 80 has secured therein a stud 8| adapted to cooperate with one of a plurality of steps 82 cut in the forward end of the rack 1I, to position said racks in accordance with the amount keys depressed as explained above.

Control keys Referring to Fig. 1, at the left of the keyboard is a row of keys adapted to control the selection and functions of the different totalzers.

An error key 83is arranged to release any ciepressed amount or control key prior to release of the machine for operation, which automatically locks said error key against depression The repeat key 84 functions in the usual manner to prevent the automatic release of depressed amount keys in add, non-add and subtract operations'.

A series of keys 85, 86, 81 and 88 (Fig.4 1) are total keys for the different totalizers and wh en used alone control the machine to clear the totalizer they represent. When one of the total keys is used in commotion with a sub-total key 89,

the totalizer is not left in a cleared position after reading as in total operations, but is restored to its original condition. I

A subtract key conditions the add-subtract totalizer for subtract operations, as explained in the above referred to Ellis Patent No. 1,203,863.

A non-add key 3l operates in the usual manner to disable all the totalzers when it is desired to print an amount or number without having such amount or number stored in one of the totalizers.

on the rignthand side of the" keyboard is a condition e'; t

ill

l pivotaiy s sairl tion. nom enel efeach lia oler ion by f2. nose operating on secured to the shaft 52 contacting and refelockwise a. lever pitman @E i otefl to the lever F ser end being bi to embrace a stu-; fast in the g Crank bhe clockwise roeki"W lever also rocks t controlling c; leicskwise until the latch i732 unfier tension reengages. controlling crank retain it in 'nome pos. ion.

'"le No. i totazer may be conditioned for s tract operations either by depression o theses tract S (Fig. el' by arranging stops on the tabulating stop bar 9 (Figs. 3 and 1G). Referring to Figs. 4 and l5, the subtract key 9U has therein a notchv 08 adapted to receive an ear H bent on a latch `pivoted on a stud Hi! carried by the left machine frame 53. A` projection |63 on the latch cooperates with a stud il@ in a toggle lever H5 also pivoted on the stuc, Plvoted on the lever H5 is an arm HS having an open-ended slot through which 'extens a stud lil fast in a lever ||8 (Figs. 15 and 5.5) pvoted en stucl fast in the frame 53. i pair oi" flexibly :neunten pawls 12B and |2| lever i8 are arranged to cooplower enel. of a flying lever |22 im carried by the operating i pivotally connects the lever te cranl; .25 secured to a shaft |26 jourrzalefl a, pair of totalizer frames |53 and IBC (Fig. Secures` on the shaft |26 is a pair of Fgs. 7 and 17) adapted to cooperate er one being loosely assembled on 'IJ @il No. totalizer shaft |38.

@ne here shown, orinectes. n voted. en a pair stud`- S35 se n forms e totalizer frames l5? and if:

r e for supporting the aci-subtract pivotalv can |32 pivote' tension Verh; engag we actuator Causes trie .tw lock when the -av articular pesi bar lever ist. M3 pivetw subtract o 2M pivoter?. EBS t angles to Thus the clocks" f ation of 'the lever -*LZ is transrrzA er. e lever 2M and then to the lever E25, rocking the latter clockwise independently of the latch Hi. causes the No.

totalizer to be properly engaged with and disengaged from the actuator rack il in the same manner as the depression of the subtract key SC previously explained.

Rocking the lever H5 clockwise either by depressing the subtract` key 9|) (Fig. 15) or `by means of the traveling carriage 98, through the link i3i rocks the lever |32 counter-clockwise thus allowing the hook on the arm to move into the path of a stud |48 carried by the crank |25. Initial movement clockwise of the plate |05, as previously explained, through the flying lever |22 and link |24 will now rock the crank means of the restoring bar |56.

| counter-clockwise causing the stud |48 to engage the hook shaped arm and rotate the shaft from the position shown in Fig. 31 to that shown in Fig. 32. This clockwise movement of the shaft |40 shifts a series of adding pawls |49 (Figs. 2 and 33) to ineffective positions, shifts a plurality of subtracting pawls |50 to effective positions and also shifts-the carrying sector spring bail (not shown) to a position rwhere the carrying sectors will be engaged by the subtract portion of a cam slot in a series of carrying cams (not here shown), but `all of which is fully described in the Ellis Patent 1,203,- 863, cited at the beginning of this specification.

Overdraft shaft operating mechanism Referring to Figs. 34 and 35, during subtract operations the No. i totalizer wheels, as previously explained, are rotated clockwise. When an overdraft occurs one of the two diametrically opposed projections |5| on a highest order wheel |52 contacts the tooth on the subtracting pawl |50, rocking said pawl clockwise to release an overdraft shaft actuator |53 loosely mounted on a shaft The actuator 53 moves clockwise under tension oi a spring |55 until it contacts a restoring par E56 pivoted between the totalizer frames |5l7 and 96d (Fig. 7). Prior to the above movement of the actuator |53 the bar i5@ is moved into the position shown in Figs. 33 and A projection iti (Figs. 34 and 35) on the actuator |53 is arranged to contact an ear |162 formed on an arm i653 secured to an overdraft shaft idd .lournaled in the totalizer frames l51 and i60.

Near the end of a machine operation the restoring bar l|56 is released and under spring tension rocks to' the position shown in 35 to allow any released transfer par/ls to function. The overdraft actuator |53 also being under spring tension travels clockwise in unison. with the restoring bar |56 whereupon the shoulder iti moves the overdraft shaft it@ counter-clockwise. Fast on the overdraft shaft is an arm E .(Figs. 4 and 33) pivotally connected by a link |66 to a pitman |617 having therein a slot that embraces a stud |63 secured in the left machine frame 53. The right end of the pitman |61 is pivoted to a latch |69 pivotally mounted on a stud |10 also secured in the left machine frame. The latch |69 has formed thereon an ear iii (,Fig. 33) arranged to enter a notch i12 in the No. 1 total key 85 to lock said key against depression when the overdraft shaft is rotated counter-clockwise by the occurrence of an overdraft as explained above.

If subsequent to an overdraft an amount large enough to over-balance the overdraft is added into the No. l. totalizer, the adding pawi EM (Figs. 2 and 33) for the highest order wheel |52 is engaged and rocked by one of the projections |5| on said wheel. This rocking of the adding pawl |49 releases an overdraft restoring lever |13 (Fig. 33) which under tension of a spring (not shown) contacts an ear |15 (Fig. 34) bent on an arm |16 integralwith the arm |63 to rock the latter clockwise, thus restoring the overdraft shaft to normal position and unlocking the total key 85. The overdraft shaft actuator |53 and the restoring lever |13 are restored to normal position each time the machine is operated by The Shift bar |40 has formed thereon a key |11, which during add operations lies beneath a shoulder |14 on the overdraft shaft actuator |53 and prevents any movement of the latter, and at the same time frees the overdraft restorer |13 since said key |11 is out of the path of the same. Moving of the shift bar |40 clockwise for subtract operations releases the overdraft shaft actuator and blocks the movement of the overdraft shaft restorer.

It is felt that further explanation of this mechanism is unnecessary, as it has been used in former Ellis machines and is fully described in Letters Patent of the United States No. 1,508,267, issued September 9, 1924 to F. W. Bernau and Patent No. 1,609,768 issued December '7, 1926 to N. W. Perkins.

overdraft indicator mechanism l An explanation will now be given of the mechanism that operates the overdraft indicator.

Referring to Figs. 4, 5 and 6, in the pitman |61 is a stud |10 arranged to extend through a hole |19 in the overdraft indicator arm |94 pivoted on a screw stud |8| in the left machine frame 53. The arm |94 has an extension |82 upon which is engraved or vprinted a positive or plus sign and a negative or minus sign. This overdraft indicator is mounted below the keyboard plate in such a manner that either the plus or negative sign is at all times visible through an opening |33 in the keyboard plate.

When the overdraft shaft lliliis rocked counterclockwise, as viewed in Fig. 4, bythe occurrence of an overdraft, the indicator is shifted to a position where the minus sign is visible through the opening in the keyboard plate. No. i totalizer is not in an overdrawn condition the plus sign is visible through the opening in the keyboard plate.

No. Z totalise?" engaging mechanism Figs. 11 and l2 illustrate the mechanism for engaging the Wheels of the No. 2 totalizer with the actuator rack and also the mechanism which cooperates with the traveling carriage to condition the No. 2 totalizer for add operations. As this mechanism is of conventional design it will be treated briefly in the. following description. Connected by a hanging bar I8@ (Fig. 11) to a hanging bar lever is a controlling latch it@ which is arranged to cooperate with a controlling crank |81 to cause theNo. 2 totalizer to be engaged with and disengaged from the actuator racks 1| at the proper time during an add operation in the same manner as the mechanism for the No. 1 totalizer, which was explained in the preceding description. Fig. 12 shows the position of the No, 2 totalizer engaging mechanism near the middle of a non-add operation.

' overdraft mechanism In the present machine the occurrence of an overdraft automatically unlocks the overdraft key 93, which is normally locked against depression. If the operator wishes to ascertain the amount of an overdraft, all that is necessary is the depression of this key. 'Depression of the overdraft key 93 releases the machine 4for an overdraft operation, consisting of three cycles, and likewise causes the printing mechanism to be disabled during the first two cycles of operation. It also causes the auxiliary differential to be engaged with and disengaged from the actuator racks at the proper time and conditions the No. 1 totalizer for a total taking operation during the rst cycle of operation, a subtract operation during the second cycle, and finally a. second total taking operation during the third cycle of operation. The first 'cycle of an over- When the f CIJ 'fik

"Q Nr" amaca@ draft operation causes the total of the No. l totalizer, which total is the complement of the overdraft, to be temporarily added into the auxiliary differential. During the second cycle this complement is subtracted from the cleared No. l totalizer, leaving the positive amount of the overn draft in the No. l totalizer and clearing the auxiliary differential. The nal or third cycle of an overdraft operation takes a total from the No. l totalizer and prints this total which is the positive amount of the overdraft, in a distinctive color on a record sheet interposed be veen the platen roll and the printing type. The overdraft mechanism is treated in detail in the following description.

Locking mechanism for overdraft Zeg/ The overdraft key (Figs. 3, 23, 2e and 36) is slidably mounted by having its upper end er;i tendinCT through a slot in the keyboard plate and its lower end slotted to embrace a stud secured in the right machine frame 54.

Secured to the righthand end of the overdraft shaft (Figs. 3 and 36) is an arm 5.9i having therein a stud 22 which extends through a slot in a link iSS. The left end of the link i93 (Figs. 23 and 36) is pivoted to a locking plate i534 pivotally mounted on stud 195 fast in the right machine frame The plate S94 Tiras a step i f adapted to cooperate with an ear i9? formed on the overdraft key to normally lock said key against depression. As previously explained, the occurrence of an overdraft rocks the overdraft shaft i0@ clockwise as viewed in Fig. 3. Such movement of the shaft 64, through the arm iai and link rocks the locking plate 34 counterclockvn'se, which removes the step i90 from the ear and unlocks the overdraft key.

Pivoted on the stud i95 (Figs. 23 and 36) is a detent 20S having a hook adapted to cooperate with the ear i9i on the overdraft key. A link ISS pivotally connects the detent 198 to a release cam arm 29d pivoted on a stud 220 secured in the right frame A spring 201 is tensioned to pull the arm and detent 198 clockwise. When the overdraft key is depressed the projection on the detent i9@ latches over the ear i9? thus retaining the overdraft key depressed during overdraft operation. The manner in which the overdraft key is released and the overdraft shaft restored to normal position at the end of an overdraft operation Wiil later described.

@verdraft cam Zine driving mechanism l series of cams for operating the overdraft mechanism has been incorporated in the present machine. These cams are rotatably mounted as a unit upon the right machine frame 54 and make one complete revolution for each overdraft operation. During normal machine operations the cams remain inoperative, the driving mechanisr. therefor being effectively coupled thereto only when the overdraft key is depressed. This overm draft cam driving mechanism Will now be explained.

A stud (Fig. 24) in the overdraft key entends through a slot in a latch 204 pivoted to an arm 2de fast on the shaft 52. A notch in the latch 201i is arranged to latch over a stud fast in a reciprocable pitman 228 which is biiurcated on its right end to embrace an undercut portion of a slotted bushing 20E fast on the shaft 52. The left end of the pitman 208 is also bifurcated to embrace a slotted portion of a 'I5 bushing 2id looselv mounted On EL S'D'lld EN im?" ried by the frame 54. Pivotally mounted on the pitman 208 is a. pair of pawls 212 and 213 (Fig. 25) each patvl having secured therein a stud 214 which extends through holes in the pitznan. These holes are of correct size to properly limit the travel of the pawls 2K2 and 213, and form stops against which the studs 214 are held by a spring 215. IThe pawls 212 and 213 are adapted to cooperate with a three-toothed feed ratchet (Figs. 2e, 25 and 27) keyed to a hub 21T journaled on the stud 211. Also keyed to the hub 2li is a six-tooth retaining ratchet 218 adapted to cooperate with a retaining pavvl 219 (Fig. 24) pivoted on the stud 220. A locking paWl 22l (Fig. 2li) pivoted on the stud 190 has therein a stud i edpted to cooperate with a projection 223 e overdraft key S3. An arcuate surface 224 e pavrl 221 is arranged to coact with a stud A spring the ratchet 2 i8 and also normally holds the patri i in a position where the arcuate surface 224 will be opposite the stud 225 thus locking the pawl 2id between two teeth of the ratchet 218 to prevent movement of the hub 217 at all times ez;- cept during overdraft operations.

Depression of the overdraft key 93 (Fig. 24) rocks the paivl 221 counter-clockwise to release the retaining paWl 219 and causes the notch 206 in the latch 204 to engage the stud 207. The arm oscillates through an approximate angie of 60 degrees each time the machine is operated. During an overdraft operation, inasmuch as the machine makes three operations, the arm 51 will make three oscillations. The first movement counter-clockwise of the arm 5I (Fig. 24) will through the arm 205 and latch 204 slide the pitman 28S to the left causing the pawl 2i2 (Fig. 25) to rotate the rachet 216, hub 21T and cam assembly keyed thereto one-sixth of a revolution counter-clock\vise, or one tooth space on the retaining ratchet 2I8. The return movement clockwise of the arm 5| returns the pitman 208 to its home position. causing the pawl 213 to engage another tooth of the feed ratchet 2l6 to rotate the hub 2H another one-sixth revolution. F e feed pawls 212 and 213 have projections i and 222, respectively, which cooperate with the feed ratchet 2i6 to prevent overthrow during fast operations.

e""rereiore, during the three cycles of an overoperation the cam assembly on the huh f' will make one complete revolution in a countei-clockwise direction.

Printer disabling mechanism Referring to Fig. 23, pivoted on the overdraft key S3 is a link 229 slotted on its lower end to embrace a stud 230 fast in a detent 23| pivoted on a stud 232 fast in the right machine frame 54. The detent 231 is notched to receive an ear 233 on a printer cam arm 234 pivoted on the ud 220. A spring 235 is tensioned to hold the 

